Pigment-color.



FRIEDRICH RUNKEL, OF ELBERFELD,

ELBERFELD, GERMANY, ASSIGNORS & CO., 0F ELIBEBFELD, GERMANY, A

AND MARTIN HERZIBERG, 0'1; OPLADEN, NEAR r0 EAEBENEABEIKEN' vonm. FRIEDR. BAYER CORPORATION or GERMANY.

PIGMENT-COLOR.

No Drawing.

To all whom it may concern:

Be it known that we, FRIEDRICH RUNKEI. and MARTIN HERZBERG, doctors of philosophy, chemists, citizens of the German Empire, residing at, respectively, Elberfeld and Opladen, near Elberfeld Germany, have invented new and useful Improvements in Pigment-Colors, of which the following is a specification.

This invention relates to the manufacture and production of new color lakes, pigment colors, which are prepared by the usual processes known-in the arts from the amdyestufl? resulting from thelcombina'tion of the diazo compound of l-naphthylamin with l-naphthol-5-sulfonic acid.

The new lakes are of a brilliant Bordeauxred shade fast to light. They are insoluble in oil and an oil color, such as white lead for instance, can be painted over them without detriment to it and without the possibility of being stained by the red, a fact which is of great importance in the use of these bodies.

In order to illustrate the new process more fully the following examples are given, the parts being by weight:

Example 1: Mix intimately 100 parts of a paste containing 10 per cent. of the azo coloring matter prepared in the usual way from diazotized l-naphthylamin and 1- naphtho1-5-sulfonic acid,

- Specification of Letters Patent. Application filed .Tune 18, 1910. Serial No. 567,695.

200 parts of wa- Patented Oct. 4, 1910.

ter and 100 parts of finely ground heavy spar. Remove the chief part of the water by filtration, dry the paste and grind the residue very thoroughly. A lake of a brilliant red color is thus obtained.

Example 2: Add gradually to an alkaline (N a 00, solution of 22.4 parts of l-naphthol-5-sulfonic acid a solutlon of 12.2 parts ofcrystallized barium chlorid and add then slowly to the cooled mixture the diazo compound obtained from 17.9 arts of l-naphthylam-in chlorhydrate. he mixture is then stirred for about 12 hours. The new pigment color is filtered oil and finished in the usual way. The preparation of pi ments with other metallic oxids or salts is carried out in an analogous manner.

I claim The new lake prepared from the azo dye derived from diazotized l-naphthylamin and l-naphthol-fi-sulfonic acid, said lake being distinguished b its valuable brilliant Bordeaux-red sha e and its fastness to light and oil, substantially as described.

In testimony whereof we have hereunto set our hands in the presence of two subscribin witnesses.

fiRIEDRICH RUNKEL. [L. s. MARTIN I-HERZBERG. [L. a} Witnesses:

O'rro Komc,

Oms. J. WRIGHT. 

